2021-05-12 02:26:00 +02:00
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ROUND2 equ 10
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stencil_tri:
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; procedure calculate triangle in stencil buffer
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; ----------------in - eax - x1 shl 16 + y1 ----------------------
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; -------------------- ebx - x2 shl 16 + y2 ----------------------
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; -------------------- ecx - x3 shl 16 + y3 ----------------------
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; -------------------- esi - pointer to s-buffer -----------------
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; -------------------- xmm0 - lo -> hi z1, z2, z3 as dword float
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.x1 equ [ebp-2]
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.y1 equ [ebp-4]
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.x2 equ [ebp-6]
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.y2 equ [ebp-8]
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.x3 equ [ebp-10]
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.y3 equ [ebp-12]
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.dx12 equ dword[ebp-20]
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.dx13 equ dword[ebp-24]
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.dx23 equ dword[ebp-28]
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.dz12 equ dword[ebp-32]
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.dz13 equ dword[ebp-36]
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.dz23 equ dword[ebp-40]
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.zz2 equ [ebp-44]
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.zz1 equ [ebp-48]
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.z3 equ [ebp-56]
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.z2 equ [ebp-60]
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.z1 equ [ebp-64]
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.s_buff equ [ebp-68]
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push ebp
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mov ebp,esp
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sub esp,128
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and ebp,0xfffffff0
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.sort2:
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cmp ax,bx
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jle .sort1
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xchg eax,ebx
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shufps xmm0,xmm0,11100001b
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.sort1:
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cmp bx,cx
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jle .sort3
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xchg ebx,ecx
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shufps xmm0,xmm0,11011000b
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jmp .sort2
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.sort3:
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mov .y1,eax ; store triangle coordinates in user friendly variables
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mov .y2,ebx
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mov .y3,ecx
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; mov edx,100.11
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; movd xmm0,edx
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; shufps xmm0,xmm0,11100000b
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movaps .z1,xmm0
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; mov dword .z1,edx
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; mov .z2,edx
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; mov .z3,edx
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mov .s_buff,esi
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mov edx,80008000h ; eax,ebx,ecx are ANDd together into edx which means that
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and edx,ebx ; if *all* of them are negative a sign flag is raised
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and edx,ecx
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and edx,eax
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test edx,80008000h ; Check both X&Y at once
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jne .loop2_end
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mov bx,.y2 ; calc delta 12
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sub bx,.y1
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jnz .dx12_make
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mov .dx12,0
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mov .dz12,0
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jmp .dx12_done
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.dx12_make:
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mov ax,.x2
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sub ax,.x1
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cwde
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movsx ebx,bx
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shl eax,ROUND2
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cdq
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idiv ebx
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mov .dx12,eax
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movss xmm1,.z2
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cvtsi2ss xmm2,ebx
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subss xmm1,.z1
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divss xmm1,xmm2
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movss .dz12,xmm1
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; mov .dz12, dword 0.11
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.dx12_done:
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mov bx,.y3 ; calc delta 13
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sub bx,.y1
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jnz .dx13_make
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mov .dx13,0
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mov .dz13,0
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jmp .dx13_done
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.dx13_make:
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mov ax,.x3
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sub ax,.x1
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cwde
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movsx ebx,bx
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shl eax,ROUND2
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cdq
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idiv ebx
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mov .dx13,eax
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movss xmm1,.z3
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cvtsi2ss xmm2,ebx
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subss xmm1,.z1
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divss xmm1,xmm2
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movss .dz13,xmm1
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; mov .dz13, dword 0.11
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.dx13_done:
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mov bx,.y3 ; calc delta 23
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sub bx,.y2
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jnz .dx23_make
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mov .dx23,0
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mov .dz23,0
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jmp .dx23_done
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.dx23_make:
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mov ax,.x3
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sub ax,.x2
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cwde
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movsx ebx,bx
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shl eax,ROUND2
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cdq
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idiv ebx
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mov .dx23,eax
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movss xmm1,.z3
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cvtsi2ss xmm2,ebx
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subss xmm1,.z2
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divss xmm1,xmm2
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movss .dz23,xmm1
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.dx23_done:
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mov edx,.z1
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mov .zz1,edx
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mov .zz2,edx
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movsx eax,word .x1
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shl eax,ROUND2 ; eax - cur x1
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mov ebx,eax ; ebx - cur x2
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mov cx,.y1
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cmp cx,.y2
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jge .loop1_end
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.loop1:
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pushad
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sar ebx,ROUND2
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sar eax,ROUND2
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; movq xmm0,.zz1
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movlps xmm0,.zz1
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; mov edx,0.11
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; movd xmm0,edx
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; shufps xmm0,xmm0,11100000b
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mov esi,.s_buff
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call stencil_line
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popad
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add eax,.dx13
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add ebx,.dx12
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movss xmm1,.zz1
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movss xmm2,.zz2
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addss xmm1,.dz13
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addss xmm2,.dz12
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movss .zz1,xmm1
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movss .zz2,xmm2
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add cx,1
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cmp cx,.y2
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jl .loop1
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.loop1_end:
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mov edx,.z2
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mov .zz2,edx
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movsx ebx,word .x2
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shl ebx,ROUND2
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mov cx,.y2
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cmp cx,.y3
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jge .loop2_end
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.loop2:
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pushad
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sar ebx,ROUND2
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sar eax,ROUND2
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movlps xmm0,.zz1
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mov esi,.s_buff
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call stencil_line
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popad
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add eax,.dx13
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add ebx,.dx23
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movss xmm1,.zz1
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movss xmm2,.zz2
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addss xmm1,.dz13
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addss xmm2,.dz23
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movss .zz1,xmm1
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movss .zz2,xmm2
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add cx,1
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cmp cx,.y3
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jl .loop2
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.loop2_end:
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add esp,128
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pop ebp
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ret
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stencil_line:
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;----------------------------------------------------
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;-------------in xmm0 - lo -> hi z1, z2
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;--------------- eax - x1 ---------------------------
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;--------------- ebx - x2 ---------------------------
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;--------------- ecx - y-----------------------------
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;--------------- esi - pointer to s-buffer
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.dz equ [ebp-4]
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.z2 equ [ebp-8]
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.z1 equ [ebp-12]
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.x2 equ [ebp-16]
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.x1 equ [ebp-20]
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.s_buf equ [ebp-24]
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; cmp eax,ebx
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; je @f
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; int3
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; @@:
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push ebp
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mov ebp,esp
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sub esp,64
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; cmp eax,0
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; jg @f
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;
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; @@:
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or cx,cx
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jle .l_quit
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cmp cx,[size_y_var]
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jge .l_quit
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movzx ecx,cx
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mov .s_buf,esi
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cmp eax,ebx
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je .l_quit
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jl .l_ok
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xchg eax,ebx
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shufps xmm0,xmm0,11100001b
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.l_ok:
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cmp ax,[size_x_var]
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jge .l_quit
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cmp bx,0
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jle .l_quit
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movlps .z1,xmm0
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mov .x1,eax
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mov .x2,ebx
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sub ebx,eax
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movss xmm0,.z2
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cvtsi2ss xmm1,ebx
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subss xmm0,.z1
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divss xmm0,xmm1
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movss .dz,xmm0
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movzx edx,word[size_x_var]
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cmp eax,1
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jge @f
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mov eax,.x1
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neg eax
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cvtsi2ss xmm2,eax
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mulss xmm2,.dz
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addss xmm2,.z1
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movss .z1,xmm2
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mov dword .x1,0
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movzx edx,word[size_x_var]
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sub edx,1
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@@:
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cmp .x2,edx
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jl @f
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mov .x2,edx
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@@:
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; mov eax,.x1
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; cmp .x2,eax
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; je .l_quit
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movzx edx,word[size_x_var]
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mov esi,.s_buf
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mov eax,ecx ; y
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mul edx
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add eax,.x1
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shl eax,2
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add esi,eax
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mov ecx,.x2
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sub ecx,.x1
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movss xmm2,.z1 ; cz
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.ccalc:
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movss xmm1,xmm2
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cmpltss xmm1,dword[esi]
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movd eax,xmm1
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cmp eax,-1
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jnz @f
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movss dword[esi],xmm2
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@@:
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add esi,4
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addss xmm2,.dz
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sub ecx,1
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jnz .ccalc
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.l_quit:
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mov esp,ebp
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pop ebp
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ret
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